Mukiri wrote:hardwood wrote:I thought it was obvious that the sap collected from the coconut palm ferments to become pombe ya mnazi? Or you want me to give details of the whole process?

Very good. Next time don't embarrass yourself by insisting you know something you don't. Hope you got educated that no fermentation takes place to convert it to something else. It is what it is. The sap, IS the mnazi!
You are wrong and you should confine yourself to preaching and adult toys, and leave matters phombe to experienced hands and walevi like us.
Fermentation does take place. The sap when coming from the coconut tree isn't alcoholic but after exudation from the plant it becomes colonised by natural yeasts that turn the sugarly sap into alcohol. Within 2hrs it has about 4% alcohol. When stored longer more sugar is turned into alcohol.
So to correct you, a coconut tree doesn't have alcohol running through its system. Rather it only has a sugarly sap that starts to ferment after its extracted by "mgema". Just like the way your freshly squeezed pineapple juice (or sliced pineapple) turns alcoholic after a day or 2 due to natural colonisation by yeasts that turn the sugars to phombe.
Educate yourself on matters mnazi here:
https://en.m.wikipedia.org/wiki/Palm_wine